flattening exercise ES6.js

const handler = (request, response) => response('Hello, World!');
const routes = {
  home: handler,
  foo: {
    bar: handler,
    baz: handler,
    qux: handler
  },
  ids: {
    1: handler,
    2: handler,
    3: handler
  },
  hello: {
    world: handler
  },
  one: {
    two: {
      three: {
        four: handler
      }
    }
  }
};

function *flatten(obj, path='') {
 for (let key of Object.keys(obj)) {
   const value = obj[key];
   let flattened = path + '/' + key;
   if (typeof value === 'function') {
     yield {
        [flattened]: value
     };
   } else {
     yield *flatten(value, flattened); 
   }
 }
};

[...flatten(routes)].map((object) => {
  console.log(JSON.stringify(Object.keys(object)));
});